Undershirt



FIG. 1 is a perspective view of an undershirt showing my new design;

FIG. 2 is a reduced front elevational view thereof;

FIG. 3 is a side elevational view of FIG. 2, the opposite side being a mirror image except for the surface motif;

FIG. 4 is a rear elevational view of FIG. 2; and

FIG. 5 is a further reduced top plan view of FIG. 2. 

The ornamental design for an undershirt, as shown and described. 